HLI1010924 / 1010924 EARMUFF LEIGHTNING L3 NRR 31 Leightning® Muff Leightning® is designed to withstand demanding use in the most rugged environments. Its steel wire headband holds up in high temperatures and aggressive chemical environments. An extra-long EVA padded foam headband and telescopic height adjustment ensure a comfortable fit. Broad, supersoft ear cushions with slow recovery foam contour evenly to ears and head. Meets ANSI S.319-1979 and CSA Z94.2-M1984 Standards.